What causes Acrobat 9 Pro Extended to throw a license error on Windows 7 & 10?

Question

What causes Acrobat 9 Pro Extended to throw a license error on Windows 7 & 10 now?
It ran fine in Windows 7 until my hard drive crashed and I had to reinstall it.
I tried all the fixes that I could dig up on the internet, but nothing worked.
The only thing different about the new install of Win7 is I also installed 'sp2'.
The previous Win7 was only sp1.
If that's the culprit, then what Win10 KB can I install to fix this in both Win7 and Win10?
Otherwise, anybody got any other ideas to figure out what's causing this?
Thanx...